//
// experimental/detail/channel_message.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef ASIO_EXPERIMENTAL_DETAIL_CHANNEL_MESSAGE_HPP
#define ASIO_EXPERIMENTAL_DETAIL_CHANNEL_MESSAGE_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"
#include <tuple>
#include "asio/detail/type_traits.hpp"

#include "asio/detail/push_options.hpp"

namespace asio {
    namespace experimental {
        namespace detail {

            template<typename Signature>
            class channel_message;

            template<typename R>
            class channel_message<R()> {
            public:
                channel_message(int) {
                }

                template<typename Handler>
                void receive(Handler &handler) {
                    ASIO_MOVE_OR_LVALUE(Handler)(handler)();
                }
            };

            template<typename R, typename Arg0>
            class channel_message<R(Arg0)> {
            public:
                template<typename T0>
                channel_message(int, ASIO_MOVE_ARG(T0) t0)
                        : arg0_(ASIO_MOVE_CAST(T0)(t0)) {
                }

                template<typename Handler>
                void receive(Handler &handler) {
                    ASIO_MOVE_OR_LVALUE(Handler)(handler)(
                            ASIO_MOVE_CAST(arg0_type)(arg0_));
                }

            private:
                typedef typename decay<Arg0>::type arg0_type;
                arg0_type arg0_;
            };

            template<typename R, typename Arg0, typename Arg1>
            class channel_message<R(Arg0, Arg1)> {
            public:
                template<typename T0, typename T1>
                channel_message(int, ASIO_MOVE_ARG(T0) t0, ASIO_MOVE_ARG(T1) t1)
                        : arg0_(ASIO_MOVE_CAST(T0)(t0)),
                          arg1_(ASIO_MOVE_CAST(T1)(t1)) {
                }

                template<typename Handler>
                void receive(Handler &handler) {
                    ASIO_MOVE_OR_LVALUE(Handler)(handler)(
                            ASIO_MOVE_CAST(arg0_type)(arg0_),
                            ASIO_MOVE_CAST(arg1_type)(arg1_));
                }

            private:
                typedef typename decay<Arg0>::type arg0_type;
                arg0_type arg0_;
                typedef typename decay<Arg1>::type arg1_type;
                arg1_type arg1_;
            };

            template<typename R, typename... Args>
            class channel_message<R(Args...)> {
            public:
                template<typename... T>
                channel_message(int, ASIO_MOVE_ARG(T)...

                t)
                :

                args_ (ASIO_MOVE_CAST(T)(t)

                ...)
                {
                }

                template<typename Handler>
                void receive(Handler &h) {
                    std::apply(ASIO_MOVE_OR_LVALUE(Handler)(h),
                               ASIO_MOVE_CAST(args_type)(args_));
                }

            private:
                typedef std::tuple<typename decay<Args>::type...> args_type;
                args_type args_;
            };

        } // namespace detail
    } // namespace experimental
} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // ASIO_EXPERIMENTAL_DETAIL_CHANNEL_MESSAGE_HPP
